Butt and mortise gage.



'6.1. SCHWANTES.

BUTT AND MORTISE GAGE.

APPLICATION FILED AUG.26| 1914.

Patented Sept. 5, 1916.

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GUSTAV JOHN SCHWANTES, 0F OAKLAND, CALIFORNIA,

BUTT AND MORTISE GAGE.

Specification of Letters Patent.

Patented Sept. 5, 19t@ Application led August 26, 1914. Serial N o. 858,780.

To all whom it may concern Be it known that l, GUSTAV JOHN SoHwANTns, a citizen of the United States, residing at 6524- Whitney street, Oakland, in the county of Alameda and the State of California, have invented a new and useful Butt and Mortise Gage, of which the following is a specification.

My invention relates to improvements in butt and marking gages in which cutter bars bearing spurs, wheels, cutters or blades are usedV for marking.

The object of my improvements is to provide in one single tool, means for performing the following operations, namely: First, marking the width and depth on door and jamb of the butt mortises, with allowance on jamb for door clearance, all with but one setting of the adjustments of the tool. Second, marking the width on doorI of the lock mortise, and on jamb of the striking plate mortise with allowance 011 jamb for door clearance, all with but one setting of the adjustments of the tool. Third, the cutting of the aforesaid markings in such a manner as to make the sides or surfaces of such cut markings, adjacent to the edges of aforesaid mortises, perpendicular to the surface into'which they are cut. I attain these objects by the mechanism illustrated in the accompanying drawing, in which:-

Figure 1 is a perspective view of the entire gage. Fig. 2 is a top view of the gage; Fig. 3 isy va cross section along the dotted line X-X f Fig. 2; Fig. t is a view of the left hand end of the gage; Fig. 5 is a bottom view.

Similar letters refer to similar parts of the gage in all views.

Two bent plates, J and C, form the body of the tool. J is the top plate, C is the bottom plate. See Fig. 3. To the right hand end of top plate J is rigidly fastened tail plate B, perpendicular to the surfaces of plate J. To the left hand end of bottom plate C is rigidly fastened head plate A, perpendicular to the surfaces of plate C. Plates J and C are fastened together with bolts f, y, in such a manner that plate J may be moved longitudinally a short distance relatively to plate C. This is accomplished by passing the bolts through short slots C in plate C.

A threaded guard nut K (see Fig. 2) is held between lugs C and P formed from top plate J, and is prevented from turning by one side resting on the surface of plate J. A screw H is provided having a flanged head, the iange of whichengages a slot, g, in the plate C and the threaded end of which passes through openings in lugs C and P and engages the nut K. This screw is turned by inserting a screwdriver through the round hole Q in the middle of head plate A. Turning screw H in or out will cause its flange to press against the right or left hand side of slot g, thus moving top plate J to the left or right, respectively, longitudinally, relatively to bottom plate C. This movement constitutes the" aforementioned door clearance adjustment.

The plates J and C are so shaped that when bolted together they, between them, form longitudinal chambers for the reception of gage bars, E, D, and L. These gage bars are movable longitudinally in their chambers, but can be fixed in position by means of thumbscrews G and M, which enter the bars through longitudinal slots in the bottom plate C. The gage bar L carries one blade R, by means of which the depth of hinge mortises is marked on jamb and door, this depth being adjustable by means of the thumbscrew M. Gage bar D is slotted and counterslotted longitudinally, being held in place relatively to gage bar E by a screw F, which enters gage bar E through the aforesaid slot, the head of the screw F bearing on the bottom of the counterslot to bind the bars D and E together. Bar E is held in place relatively to bottom plate C by means of thumbscrew G, working in a longitudinal slot in plate C. Bar E bears a blade at each end, both blades being so shaped that their outer or end faces are perpendicular to the longitudinal faces of bar E, while their inner faces are beveled outward to form a cutting or marking point or edge. Blade e pro- -to allow for clearance.

jects downward, and blade b projects upward, from bar E. Similarly with blades a and Z on bar D. See Fig. 2.

In Fig. 2 the gage is set for marking the butt mortise. Bars D and E are set with their ends flush with each other so that blades a and e will make but one mark, thus gaging the width of the mortise when head plate A is placed against the face of the door, and the tool is moved so as to mark the edge of the door. VTo mark the Ydepth of'this mortise, the blade of bar L is used,with the head plate A against the edge of the door. To mark the width of the butt mortise on the jamb, the tool is turned end for end, the tail plate B is placed againstthe rabbet of the jamb, and theV blades b and d are used to mark the edge of the mortise.

TheY distance between head plate A and blades a and e is the difference between the thickness of door and width of mortise, i. e., it is the distance from faceof door to edge of mortise; and the distance from outside of tail plate B to blades d and b is the distance from rabbet to edge-of jamb mortise. Therefore by making the distance between plate B and blades LZ and b greater than that between plate A and blades a and e, a clearance is provided between face of door and rabbet of jamb. This clearance may be increased by turning back on screw H, which moves top plate J and tail plate B fastened thereto, to the right, relatively to plate C. To mark the lock mortise, loosen screw F, pull out barD, the head plate A being cut away toallow blade CZ to come through; then reverse bar D and push it back into its chamber beside bar E until the distance between yblade d and blade e is the width of the lock plate; then tighten screw F. See Fig. 5. Loosen thumbscrew Gr and push bars D and E in or out until the distance from the head plate A to blade e is equal tothe required distance from the face of door to adjacent edge of lock plate. Then tighten'thumbscrew G and adjust screw H The blades d and c will mark for Vthe lock plate when head plate A is applied to face of door, and the blades a and b at the other end of the bars D and E will mark for the striking plate on the jamb, when tail plate B is applied to the rabbet of that jamb.

, Note that the blades are so beveled to their cutting edges that the cut made by them will always kbe squareto the surface at the outer edge or edges of the mortise.

Thus are accomplished the three purposes set forth on page 1 of this specication.

` 1. In a marking gage comprising the combination of an upper and lower body plate, saidplates being bent to form longitudinal chambers, gage bars slidably mounted in said chambers, gage plates one attached to each of said body plates and on the opposite end thereof, means for adjustably moving said body plates longitudinally with reference to each other and means for holding said plates in fixed relation to each other.

2'. In a marking gage comprising two body plates bent to form longitudinal chambers therebetween, a plurality of gage bars slidably mounted in said chambers, a screw threaded abutment on one of said body plates, the other of said plates having a transverse slot, a screw adapted to engage said abutment, an enlarged flanged head on said screw adapted to engage the slot in the other of said plates and gage plates at right angles to the aXes of said gage bars, one attached to each of said body plates at opposite ends thereof.

3. In a marking gage comprising two body plates bent to form two longitudinal chambers therebetween, a single gage bar slidably mounted in one of said chambers and two gage bars slidably mounted in the other of said chambers, gage plates perpendicular to the axes of said gage bar attached one to each of said body plates at the opposite ends thereof, and means for clamping said gage bars between said body plates.

4. In a marking gage comprising two body plates bent to form two longitudinal chambers therebetween, a single gage bar slidably mounted in one of said chambers and two gage bars slidably mounted in the other of said chambers, means for holding said last-mentioned gage bars in adjusted relation to each other, cutting blades on each end of said last-mentioned bars, gage plates perpendicular to said bars attached one to each end of said body plates at opposite end thereof and means for clamping said gage bars between said plates.

5. In a marking gage comprising two body plates bent to form two longitudinal chambers therebetween, means for adjustably moving said plates longitudinally with reference to each other, a single gage bar slidably mounted in one of said chambers and two gage bars slidably mounted in the other of said chambers, means for holding said last-mentioned gage bars" in adjusted relation to each other, cutting blades on each end of said last-mentioned bars, gage plates perpendicular to said bars attached one to each end of said body plates at opposite end thereof and means for clamping said gage bars between said plates.

6. In a marking gage comprising a plurality of gage bars, a body portion comprisingv two coacting members inclosing said gage bars therebetween, means for moving said body members longitudinally upon each other and a gage plate carried by the opposite end of each of said members.

7. In a marking gage comprising a plurality of gage bars, a body portion comprising two eoacting members inclosing said gage bars therebetween, gage plates carried by the opposite end of said members, means ing said gage bars in fixed position within said body members.

GUSTAV JOHN SCHWANTES.

for moving said members with reference to Witnesses: each other, means for holding said members C. W. BODEN, in fixed relation and other means for hold- J. A. FARRELL.

opiea of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents. Washington, D. C. 

